SPV: Mainnet sync uses embedded MnListDiff that is below latest checkpoint 2,300,000

[pauldelucia]

This may not be an actual issue but just noting it here to come back to when I have time.

Logs:

2025-11-27T05:41:27.973295Z  INFO dash_spv::sync::masternodes: 📦 Using embedded MNListDiff for dash - starting from height 2227096

2025-11-27T05:41:30.290693Z ERROR dash_spv::sync::masternodes: ❌ MnListDiff insertion failed: Failed to get height for base block hash 000000000000000899fdcd85241296146c365b238a655517da8dcd08a8a79b98: Height not found for block hash: 000000000000000899fdcd85241296146c365b238a655517da8dcd08a8a79b98

Code:

// dash-spv/src/sync/masternodes.rs

impl<S: StorageManager + Send + Sync + 'static, N: NetworkManager + Send + Sync + 'static>
    MasternodeSyncManager<S, N>
{
    /// Create a new masternode sync manager.
    pub fn new(config: &ClientConfig) -> Self {
        let (engine, mnlist_diffs) = if config.enable_masternodes {
            // Try to load embedded MNListDiff data for faster initial sync
            if let Some(embedded) = super::embedded_data::get_embedded_diff(config.network) {
                tracing::info!(
                    "📦 Using embedded MNListDiff for {} - starting from height {}",
                    config.network,
                    embedded.target_height
                );

// dash-spv/src/sync/embedded_data.rs

/// Get the embedded MNListDiff for a specific network, if available.
pub fn get_embedded_diff(network: Network) -> Option<EmbeddedDiff> {
    match network {
        Network::Dash => {
            let bytes = MAINNET_MNLIST_DIFF_0_2227096;
            match deserialize::<MnListDiff>(bytes) {
                Ok(diff) => Some(EmbeddedDiff {
                    diff,
                    base_height: 0,
                    target_height: 2227096,
                }),
                Err(e) => {
                    tracing::warn!("Failed to deserialize embedded mainnet MNListDiff: {}", e);
                    None
                }
            }
        }

[xdustinface]

Related code has been rewritten in #411